PHGY 209 Lecture Notes - Lecture 6: Glossopharyngeal Nerve, Blood Pressure, Pituitary Gland
17 Mar 2017
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1: ans = sensory & motor system, stimulating visceral tissues & organs, connected o homeostasis - ability of org. to maintain internal conditions if external envir. changes. These systems are: sympathetic system cardiac, smooth muscle, glandular tissue, parasympathetic system cardiac, smooth muscle, glandular tissue, enteric system digestive tract. Constantly working in balance not just sitting around and waiting work together to maintain homeostasis (like a tug-of: symp. Anatomical organization (outputs: differs from somatic ns b/c has two neurons connecting cns/spinal cord to target organs, preganglionic neuron in spinal cord/brainstem: When activated, change the physiology of target cell. Sympathetic ns (spinal cord thoracic & lumbar) parasympathetic ns (brain stem & sacral spinal cord (bottom: short preganglion, long postganglion, pre g. neurons release ach activates. Sensory inputs to ans: ans responds to variety of sensory inputs, monitored by sensory neurons. Ex: stimulation of pain sensing n. activates symp. ** process: info from, visceral organs go through vagus nerve to reach the brain.
